Pencil-sharpener.



l. K. STEWART. PENCIL SHARPENER. APPLICATION FILED IuLY 6.1914.

x?. I ew 9. m a w W 1w n m W Bill/[Ill w T BAEB# BAT JOHN K. STEWART, 0FCHICAGO, ILLINOIS, ASSIG'NOR T0 STEWART MANFACTURING COMPANY-y CHICAGO,ILLINOIS, A CORPORATION 0F ILLINOIS.

PENCIL-SHARPENER.

Specification of Letters Patent.

lPatentedNov. 9, 1915.

aptncation filed July c, 1914. l' serialY No. 849,104.

It consists of the features and elementsf described .and shown in thedrawings asindicated in the claims.

In the drawingsz-Figure 1 is a side elevation of a device embodying thisinvention, having the case broken away to show the interior parts. Fig.2 is a section at the line` 2-2 on Fig'. 4. Fig. 3 is a section at theline 3-3 on Fig. 4. Fig. 4 is a. section at the line, 4 4, on Fig. 2.Fig. 5 isajsection'at the line. 5'-5, on Fig. 4.

The device shown in the drawings comprises a casing,-A, which ispreferably die# cast and integral. This casing comprises as an integralpart thereof an elongated shaft bearing, 3, protruding outwardly, and afixed internal gearl or` annularinternally toothed rack, 4, formed in ah'ollowed boss or flange, B2, projecting inward in the' casing co-axialwith the outwardly protruding shaft' bearing, 3. Journaled in thebearing, 3, is a rotating member, B, havinglan elongated spindle, 5, forjournaling ,in said shaft bearing and-projecting there-beyond to receivean operating handle, 6, and havf ing a circular base, B1, around Atheinner end of the spindle, which base enters within and closes the cavityof the inwardly-projecting boss, B2, whose inner end constitutes theinternally-toothed rack, 4, above mentioned. The cavities thus inclosedmay serve as a grease pocket forlubricatioh ot. the spindle the circularbase closing said pocket, serving to prevent the grease from Yescapingso as to soil the pencil or Vmingle with the shavings. The rotatingmember is of such dimension as to extend entirely through the casing andthere-beyond at the end opposite the spindle in the form of a hollowboss, 7, whose axial cavity constistutes a pencil'guide. This pencilguide protrudes at the center of the circular head, 8, of the rotatingmember, which head guides and closes a .circular aperture in the wallof' the casing, A, at the side opposite that at which the internal.annular rack, 4, is situated. At thejportion of the rotating memberwhich extends between the front andrear walls of the casing,-that is,from the face of the spindle, 5, to the inner face of the head, 8,-it isprovided with diametrically opposite recesses, 10,10, which accommodaterotating cutters', 11, 11, each having at its 'end toward the spindle abevel gear, 12, said bevel gears meshing with the internal annular rack,4. These cutters 'are eachaxially apertured and 4journaled for rotationuponv a shaft, 13, which is inserted through the head, 8, on the outerside 'thereof, havlngthe opposite end threaded and screwed into therotating memberv at the shonlderwhich defines the inner end of therecess in which the rotating cutteris ac-` .commodated rlhe two cuttersare each cylindrical with spiral cutting edges, 15, each of said`cutting edges extending continuously from one end `to 'the other of theoperating portion of the length of the cutter.

at an acute angle vlto each other which-isA bisected byv aplane throughthe axis of rotation of said member, said cutters converging from outerto inner end, that is, from the end at which the pencil guide issituated to the end having the pinions for meshing with the internalrack. 'll`he recesses formed in the rotating member to accommodate thetwo cutters thus Yconverging toward'the pinions, cut into each other asthey approach said end toward which they converge, leaving standingbetween the cutters a tapered portion of the substance of thef" rotatingmember aty the inner end of the pencil-guide-way; and said pencil lguideis bored tapering at said inner end, forming a' tapering seat betweenthe two cutters at their di'verging ends. The conical bore for thistapering seat'cuts into the portion of ,the rotating member leftstanding between `'lheysare mounted in the rotating member sharpened orcut away,

be forced in only as fast as the polnted lead vagainst said bar,

pinions engaging the annular' rack, while they receive planetary motionabout the pencil axis by-rotation of said rotating member about the saidaxis.

` The two cutters are mounted in the rotating member so that theircutting edges just clear each .other at their proximate ends, and theyare reduced in diameter beyond that point forming lannular shoulders,18, between which there is mounted on the carrier a stop bar, 20, whichextends across'the axis of the rotating member and of thepencil to vbesharpened, and forms a stop for the point of the pencil so that when thepencil has been sharpened to the finest point for which the device isadapted, that point rests farther 'pushed 'in of the reduced point .willcrumble under the pressure as and the pencil. can

' crumbles.

The case 1s cut away' at one side of the' lower end forming' an opening,22; tore 'ceive a slide drawer, 23, which stands below the cutters andreceives the pencil 'trim'- mings.

I claim 1. A pencil sharpenercomprising a casing having a shaft-.bearingextendingoutwardly from one end thereof and having at the same end anannular inwardly-projecting ange concentric with lsaid bearing andforming a chamber about the inner end thereof; a rotating member havinga spindle journaled in said shaft-bearing, and a circular base whichcloses the inner end of said chamber; cutters journaled .for rotation insaid rotating member between the end having the spindle and the oppositeend thereof,'said Icutters being provided with means lfor engaging saidannular flan-ge' for rotation of the cutters in the rotating member whenthe latter is rotated in the casing.

2. A pencil sharpener comprising a casing having a shaft-bearingextending outwardly from one end thereof; al rotating A member having aspindle journale'd in said shaft-bearing; diverging cutters journaled insaid rotating `member betweenv the` end having the spindle and theopposite end thereof, for rotation both in and with said rotatingmember,- said member having at the end opposite the spindle a circularhead whose diameter is at least 4as great as that of the path ofrotation of said cutters about and if the pencil is still' by the-,operator the lead fast as the pencil is. furtherl the spindle axis atthe point of greatest diameter of said path, and the case having at theend opposite said shaft bearing a cir- -cular opening which said headfits and closes when the rotatingmember is in operating position in thecase.

3. A pencil Sharpener comprising al casing having,a` shaftbearingextending out'- wardly from one end thereof and having at the same endAanannular inwardly-projecting hollowed boss having its cavity concentricwith said' bearing; aj rotating member having aspindle journaled in saidshaftbearing, and cutters journaled forfrotation in said rotating memberbetween the end having the spindle and the opposite end thereof, theoppositeI end of the casing having a circular aperture throughwhichrsaid rotating member .and the cutters thereon may ybe enteredbodily for. inserting thespindle in the spindle bearing to operatingposition, said rotating member having a circular head opposite the endhaving-thespindle which fits and closes said circular opening, therotating'cutters being provided with means for engaging the hollowedboss for rotation of the cutters inthe rotating-mem- .ber when thelatter is rotated in the casing,

jecting ,hollowed 'boss concentric with said bearing and forming a4chamber about 'the inner end thereof; a rotating member having a spindlejournaled in said shaft-bearing, and bearings for rotary cutters to bemounted for rotation both in andwith said rotary member, said rotarymember having between the base -of the spindle and said cutter bearingsa circular base which its and vcloses the inner 'end ofthe chamberformed by said hollowed boss.

In testimony-"whereof, I have hereunto set.

my hand at Chicago, Illinois,- this lstpday of July, 1914.

' JOHN K. STEVIART. Witnesses:

EDNA M. MAcIn'rosH, LUCY I STONE.4

